At OCS, you will keep all your belongings that are not on display locked in a drawer around ~4ft x ~3ft. This includes both the stuff you bring into OCS and all the additional gear they issue you. As a result, less is more...
This is not a definitive list. When I went to OCS, I brought way too much.
Here is my personal list of everything I would bring (and nothing else beyond this list) if I were to go to OCS again:
Absolute necessities:
3-4 pairs of BLACK Fox river/ thorlos boot socks
Not to beat a dead horse, but these socks are an undisputed necessity for OCS. The boots/ boot socks they issue you are garbage, and you will destroy your feet.
2x packs of baby wipes
You will not have enough time after PT in the mornings to shower. Baby wipes are going to be your best friend.
1x plastic clip board
Almost everyone brings a clipboard for bed making.
1x general toiletries
You will have access to buy toiletries at OCS. The opportunity is uncommon. You will not have an opportunity within the first couple of days.
1x pack of tide pods
Laundry
Highly recommend:
1x measurement ninja star
A lot of people will bring these, but it's nice to have your own for inspections.
1x roll of masking tape
Only really useful for the first couple of weeks
1x blanket and pillow
The bedding you get is trash and you'll want your sheets in good condition for inspections.
1x towel
The towel they issue is trash and used for inspection
4x pairs of spandex shorts
Compression shorts are not issued, so only if you need them for PT
Females:
4-6x sports bras
Sports bras are not issues. Bring your own
Full set of hair ties/ clips
Must be same color as hair or black... no fun colors
Extra supply of pads/tampons
2x hairspray
Males:
Quality razors
You'll be shaving every day
Anti razor bump shaving cream (Bump Patrol)
Optional but my friends were pretty insistent on this one
If you're going in the winter time
2x chapsticks
1x body and face lotion
Do not bring:
(I wish I was kidding, but during my time at OCS, I saw people try to bring every single one of these items listed below)
Ammo
Weapons
Condoms
Food
Caffeine
Medications (see medications below... this includes over-the-counter, unless Rx)
Medications
Unless you have a written prescription from a doctor, all medications (including over-the-counter meds such as Advil, melatonin and TUMS) are not allowed. If you need to bring medications into OCS, get a doctor's prescription before you arrive. There is medical at OCS, however, it is a process.
FEMALES... PLEASE, if you have menstrual cramps, get an Rx beforehand. If you get to OCS and do not have an Rx, tell one of your INDOC Candios asap that you need to go to medical to get pain meds.